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RE: Rotary Spark gaps (fwd)



---------- Forwarded message ----------
Date: Fri, 03 Aug 2007 23:21:50 +0000
From: David Rieben <drieben@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Cc: drieben@xxxxxxxxxxx
Subject: RE: Rotary Spark gaps (fwd)

Hi Steve,

While electrical grade fiberglass will work and is considerably cheaper 
than G-10, from my personal experience, it is NOT as good as G-10
for this purpose. I did originally use the GPO-3 electrical grade fiber-
glass for my rotary disc for my large coil. I used set screws to hold the
flying electrodes inplace and the fiberglass was too structurally unsound
to allow the set screws to be tightened down firmly without the threading
stripping out. Once I changed over to G-10, this problem completely dis-
appeared.

--
David Rieben

-------------- Original message -------------- 
From: "Tesla list" <tesla@xxxxxxxxxx> 

> 
> ---------- Forwarded message ---------- 
> Date: Fri, 3 Aug 2007 12:42:27 -0600 
> From: S&JY 
> To: 'Tesla list' 
> Subject: RE: Rotary Spark gaps (fwd) 
> 
> RSG Builders, 
> 
> There are other materials than G10 that can be successfully used for RSGs. 
> Electrical-Grade Fiberglass (GPO3) works very well, has the needed strength 
> and electrical properties, is easier to machine, and costs less than G10. 
> It is available from McMaster-Carr: Look up their stock number 8549K47 for 
> an example. 
> 
> --Steve Y. 
> 
> -----Original Message----- 
> From: Tesla list [mailto:tesla@xxxxxxxxxx] 
> Sent: Thursday, August 02, 2007 10:13 PM 
> To: tesla@xxxxxxxxxx 
> Subject: Re: Spark gaps (fwd) 
> 
> 
> ---------- Forwarded message ---------- 
> Date: Thu, 02 Aug 2007 22:37:24 -0400 
> From: Scott Bogard 
> To: tesla@xxxxxxxxxx 
> Subject: Re: Spark gaps (fwd) 
> 
> Matthew, 
> If the thought of using "machined" G10 scares you a little (I don't 
> have machines, so I find it scary myself) consider building a propeller gap, 
> 
> like these. 
> http://www.tb3.com/tesla/sparkgaps/index.html 
> These are the type of gaps I use, and the only machine I need is a drill and 
> 
> a saw (no lathes or mills). They work good for me, and should also work 
> good for you (although I have never tested the two side by side). Either 
> way, no static gap is ever going to be as good for handling high power as a 
> really well made rotary (I got huge increases when I switched, despite the 
> fact I also greatly reduced my power input. I should also mention my rotary 
> 
> is not perfect, and it still works far better than all the other gaps I 
> tried). Good luck. 
> Scott Bogard. 
> 
> 
> >From: "Tesla list" 
> >To: tesla@xxxxxxxxxx 
> >Subject: Re: Spark gaps (fwd) 
> >Date: Thu, 2 Aug 2007 20:08:04 -0600 (MDT) 
> > 
> > 
> >---------- Forwarded message ---------- 
> >Date: Thu, 02 Aug 2007 02:20:24 -0700 
> >From: Barton B. Anderson 
> >To: Tesla list 
> >Subject: Re: Spark gaps (fwd) 
> > 
> >Hi Matthew, 
> > 
> >I concur with what D.C. has proposed here. If you want a "great spark 
> >gap", do it right! A G10/tungsten gap with a well balanced machined disc 
> >and large enough tungsten electrodes for the power applied is important. 
> >Anything less will suffer greater losses. You can use tungsten tips or 
> >pure tungsten rod stock (both are good). If your looking for a clear 
> >winner, this is it. 
> > 
> >Take care, 
> >Bart 
> > 
> > 
> > >A good RSG is required around 5 kVA and upwards. 
> > > 
> > >With 5-12 kVA run 1/2" dia. brass feedthrus, 1.5 inches long, with 
> > >replaceable 1/2" dia. tungsten tips. Stationary electrodes are 1 inch 
> >dia. 
> > >tungsten, screw-in type. 2 x 2 inch dia brass block as stationary 
> >holders. 
> > >12" dia. x 1/2 inch G-10 rotor. 10 electrodes 3450 rpm. 1/2 HP motor. 
> > > 
> > >above 12 kVA, run 1" dia. brass feedthrus, 2.0 inches long, with 
> >replaceable 
> > >screw-in 1" tungsten tips. Stationary electrodes are 1.5 inch dia.. 3 
> >x 3 
> > >inch dia. brass block heatsinks as stationary holders. 18" dia. rotor x 
> > >1/2" G-10. 10 electrodes 1725 rpm., 1HP motor. 
> > > 
> > > 
> > > 
> > >Dr. Resonance 
> > >Resonance Research Corp. 
> > >www.resonanceresearch.com 
> > > 
> > > 
> > >----- Original Message ----- 
> > >From: "Tesla list" 
> > >To: 
> > >Sent: Thursday, August 02, 2007 11:16 AM 
> > >Subject: Spark gaps (fwd) 
> > > 
> > > 
> > > 
> > > 
> > >>---------- Forwarded message ---------- 
> > >>Date: Thu, 02 Aug 2007 11:09:45 -0500 
> > >>From: Matthew Boddicker 
> > >>To: tesla@xxxxxxxxxx 
> > >>Subject: Spark gaps 
> > >> 
> > >>This is Matthew Boddicker. 
> > >> 
> > >>Over the past year I have seen many different types of spark gaps and 
> >I'm 
> > >>going to take on a large project that requires a very good spark gap. 
> >What 
> > >>is the best spark gap? If there isn't a clear winner then what 
> > >>circumstances 
> > >>would justify which kind of spark gap? 
> > >> 
> > >>Thanks everyone! 
> > >> 
> > >>_________________________________________________________________ 
> > >>Learn.Laugh.Share. Reallivemoms is right place! 
> > >>http://www.reallivemoms.com?ocid=TXT_TAGHM&loc=us 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> 
> _________________________________________________________________ 
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> 
> 
> 
> -- 
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